Techniques of controlling operation of M-DCI based M-TRP reception

ABSTRACT

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives a first trigger. The UE determines, based on the first trigger, whether it is possible that a first transmission and reception point (TRP) and a second TRP are to transmit a first down link control channel and a second down link control channel to the UE concurrently on a carrier. The UE monitors the first down link control channel and the second down link control channel in a particular slot when it is possible that the first TRP and the second TRP are to transmit the first down link control channel and the second down link control channel to the UE concurrently on the carrier.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims the benefits of U.S. Provisional ApplicationSer. No. 62/828,574, entitled “PDCCH MONITORING AND RELATED RRCCONFIGURATION and filed on Apr. 3, 2019, which is expressly incorporatedby reference herein in their entirety.

BACKGROUND Field

The present disclosure relates generally to communication systems, andmore particularly, to techniques of receiving at a UE data transmissionfrom multiple transmission points.

Background

The statements in this section merely provide background informationrelated to the present disclosure and may not constitute prior art.

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources. Examples of suchmultiple-access technologies include code division multiple access(CDMA) systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, orthogonal frequency divisionmultiple access (OFDMA) systems, single-carrier frequency divisionmultiple access (SC-FDMA) systems, and time division synchronous codedivision multiple access (TD-SCDMA) systems.

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. An example telecommunication standardis 5G New Radio (NR). 5G NR is part of a continuous mobile broadbandevolution promulgated by Third Generation Partnership Project (3GPP) tomeet new requirements associated with latency, reliability, security,scalability (e.g., with Internet of Things (IoT)), and otherrequirements. Some aspects of 5G NR may be based on the 4G Long TermEvolution (LTE) standard. There exists a need for further improvementsin 5G NR technology. These improvements may also be applicable to othermulti-access technologies and the telecommunication standards thatemploy these technologies.

SUMMARY

The following presents a simplified summary of one or more aspects inorder to provide a basic understanding of such aspects. This summary isnot an extensive overview of all contemplated aspects, and is intendedto neither identify key or critical elements of all aspects nordelineate the scope of any or all aspects. Its sole purpose is topresent some concepts of one or more aspects in a simplified form as aprelude to the more detailed description that is presented later.

In an aspect of the disclosure, a method, a computer-readable medium,and an apparatus are provided. The apparatus may be a UE. The UEreceives a first trigger. The UE determines, based on the first trigger,whether it is possible that a first transmission and reception point(TRP) and a second TRP are to transmit a first down link control channeland a second down link control channel to the UE concurrently on acarrier. The UE monitors the first down link control channel and thesecond down link control channel in a particular slot when it ispossible that the first TRP and the second TRP are to transmit the firstdown link control channel and the second down link control channel tothe UE concurrently on the carrier.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed, and this description is intended to include all suchaspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network.

FIG. 2 is a diagram illustrating a base station in communication with aUE in an access network.

FIG. 3 illustrates an example logical architecture of a distributedaccess network.

FIG. 4 illustrates an example physical architecture of a distributedaccess network.

FIG. 5 is a diagram showing an example of a DL-centric subframe.

FIG. 6 is a diagram showing an example of an UL-centric subframe.

FIG. 7 is a diagram illustrating communications between a UE and twoTRPs.

FIG. 8 is a diagram illustrating a resource grid in a slot used by a UEfor M-TRP reception.

FIG. 9 is a flow chart of a method (process) for receiving datatransmitted from multiple TRPs.

FIG. 10 is a conceptual data flow diagram illustrating the data flowbetween different components/means in an exemplary apparatus.

FIG. 11 is a diagram illustrating an example of a hardwareimplementation for an apparatus employing a processing system.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the appendeddrawings is intended as a description of various configurations and isnot intended to represent the only configurations in which the conceptsdescribed herein may be practiced. The detailed description includesspecific details for the purpose of providing a thorough understandingof various concepts. However, it will be apparent to those skilled inthe art that these concepts may be practiced without these specificdetails. In some instances, well known structures and components areshown in block diagram form in order to avoid obscuring such concepts.

Several aspects of telecommunication systems will now be presented withreference to various apparatus and methods. These apparatus and methodswill be described in the following detailed description and illustratedin the accompanying drawings by various blocks, components, circuits,processes, algorithms, etc. (collectively referred to as “elements”).These elements may be implemented using electronic hardware, computersoftware, or any combination thereof. Whether such elements areimplemented as hardware or software depends upon the particularapplication and design constraints imposed on the overall system.

By way of example, an element, or any portion of an element, or anycombination of elements may be implemented as a “processing system” thatincludes one or more processors. Examples of processors includemicroprocessors, microcontrollers, graphics processing units (GPUs),central processing units (CPUs), application processors, digital signalprocessors (DSPs), reduced instruction set computing (RISC) processors,systems on a chip (SoC), baseband processors, field programmable gatearrays (FPGAs), programmable logic devices (PLDs), state machines, gatedlogic, discrete hardware circuits, and other suitable hardwareconfigured to perform the various functionality described throughoutthis disclosure. One or more processors in the processing system mayexecute software. Software shall be construed broadly to meaninstructions, instruction sets, code, code segments, program code,programs, subprograms, software components, applications, softwareapplications, software packages, routines, subroutines, objects,executables, threads of execution, procedures, functions, etc., whetherreferred to as software, firmware, middleware, microcode, hardwaredescription language, or otherwise.

Accordingly, in one or more example embodiments, the functions describedmay be implemented in hardware, software, or any combination thereof. Ifimplemented in software, the functions may be stored on or encoded asone or more instructions or code on a computer-readable medium.Computer-readable media includes computer storage media. Storage mediamay be any available media that can be accessed by a computer. By way ofexample, and not limitation, such computer-readable media can comprise arandom-access memory (RAM), a read-only memory (ROM), an electricallyerasable programmable ROM (EEPROM), optical disk storage, magnetic diskstorage, other magnetic storage devices, combinations of theaforementioned types of computer-readable media, or any other mediumthat can be used to store computer executable code in the form ofinstructions or data structures that can be accessed by a computer.

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network 100. The wireless communications system(also referred to as a wireless wide area network (WWAN)) includes basestations 102, UEs 104, and a core network 160. The base stations 102 mayinclude macro cells (high power cellular base station) and/or smallcells (low power cellular base station). The macro cells include basestations. The small cells include femtocells, picocells, and microcells.

The base stations 102 (collectively referred to as Evolved UniversalMobile Telecommunications System (UMTS) Terrestrial Radio Access Network(E-UTRAN)) interface with the core network 160 through backhaul links132 (e.g., S1 interface). In addition to other functions, the basestations 102 may perform one or more of the following functions:transfer of user data, radio channel ciphering and deciphering,integrity protection, header compression, mobility control functions(e.g., handover, dual connectivity), inter-cell interferencecoordination, connection setup and release, load balancing, distributionfor non-access stratum (NAS) messages, NAS node selection,synchronization, radio access network (RAN) sharing, multimediabroadcast multicast service (MBMS), subscriber and equipment trace, RANinformation management (RIM), paging, positioning, and delivery ofwarning messages. The base stations 102 may communicate directly orindirectly (e.g., through the core network 160) with each other overbackhaul links 134 (e.g., X2 interface). The backhaul links 134 may bewired or wireless.

The base stations 102 may wirelessly communicate with the UEs 104. Eachof the base stations 102 may provide communication coverage for arespective geographic coverage area 110. There may be overlappinggeographic coverage areas 110. For example, the small cell 102′ may havea coverage area 110′ that overlaps the coverage area 110 of one or moremacro base stations 102. A network that includes both small cell andmacro cells may be known as a heterogeneous network. A heterogeneousnetwork may also include Home Evolved Node Bs (eNBs) (HeNBs), which mayprovide service to a restricted group known as a closed subscriber group(CSG). The communication links 120 between the base stations 102 and theUEs 104 may include uplink (UL) (also referred to as reverse link)transmissions from a UE 104 to a base station 102 and/or downlink (DL)(also referred to as forward link) transmissions from a base station 102to a UE 104. The communication links 120 may use multiple-input andmultiple-output (MIMO) antenna technology, including spatialmultiplexing, beamforming, and/or transmit diversity. The communicationlinks may be through one or more carriers. The base stations 102/UEs 104may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100 MHz) bandwidthper carrier allocated in a carrier aggregation of up to a total of YxMHz (x component carriers) used for transmission in each direction. Thecarriers may or may not be adjacent to each other. Allocation ofcarriers may be asymmetric with respect to DL and UL (e.g., more or lesscarriers may be allocated for DL than for UL). The component carriersmay include a primary component carrier and one or more secondarycomponent carriers. A primary component carrier may be referred to as aprimary cell (PCell) and a secondary component carrier may be referredto as a secondary cell (SCell).

The wireless communications system may further include a Wi-Fi accesspoint (AP) 150 in communication with Wi-Fi stations (STAs) 152 viacommunication links 154 in a 5 GHz unlicensed frequency spectrum. Whencommunicating in an unlicensed frequency spectrum, the STAs 152/AP 150may perform a clear channel assessment (CCA) prior to communicating inorder to determine whether the channel is available.

The small cell 102′ may operate in a licensed and/or an unlicensedfrequency spectrum. When operating in an unlicensed frequency spectrum,the small cell 102′ may employ NR and use the same 5 GHz unlicensedfrequency spectrum as used by the Wi-Fi AP 150. The small cell 102′,employing NR in an unlicensed frequency spectrum, may boost coverage toand/or increase capacity of the access network.

The gNodeB (gNB) 180 may operate in millimeter wave (mmW) frequenciesand/or near mmW frequencies in communication with the UE 104. When thegNB 180 operates in mmW or near mmW frequencies, the gNB 180 may bereferred to as an mmW base station. Extremely high frequency (EHF) ispart of the RF in the electromagnetic spectrum. EHF has a range of 30GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters.Radio waves in the band may be referred to as a millimeter wave. NearmmW may extend down to a frequency of 3 GHz with a wavelength of 100millimeters. The super high frequency (SHF) band extends between 3 GHzand 30 GHz, also referred to as centimeter wave. Communications usingthe mmW/near mmW radio frequency band has extremely high path loss and ashort range. The mmW base station gNB 180 may utilize beamforming 184with the UE 104 to compensate for the extremely high path loss and shortrange.

The core network 160 may include a Mobility Management Entity (MME) 162,other MMES 164, a Serving Gateway 166, a Multimedia Broadcast MulticastService (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC)170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be incommunication with a Home Subscriber Server (HSS) 174. The MME 162 isthe control node that processes the signaling between the UEs 104 andthe core network 160. Generally, the MME 162 provides bearer andconnection management. All user Internet protocol (IP) packets aretransferred through the Serving Gateway 166, which itself is connectedto the PDN Gateway 172. The PDN Gateway 172 provides UE IP addressallocation as well as other functions. The PDN Gateway 172 and the BM-SC170 are connected to PDNs 176. The PDNs 176 may include the Internet, anintranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service(PSS), and/or other IP services. The BM-SC 170 may provide functions forMBMS user service provisioning and delivery. The BM-SC 170 may serve asan entry point for content provider MBMS transmission, may be used toauthorize and initiate MBMS Bearer Services within a public land mobilenetwork (PLMN), and may be used to schedule MBMS transmissions. The MBMSGateway 168 may be used to distribute MBMS traffic to the base stations102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN)area broadcasting a particular service, and may be responsible forsession management (start/stop) and for collecting eMBMS relatedcharging information.

The base station may also be referred to as a gNB, Node B, evolved NodeB (eNB), an access point, a base transceiver station, a radio basestation, a radio transceiver, a transceiver function, a basic serviceset (BSS), an extended service set (ESS), or some other suitableterminology. The base station 102 provides an access point to the corenetwork 160 for a UE 104. Examples of UEs 104 include a cellular phone,a smart phone, a session initiation protocol (SIP) phone, a laptop, apersonal digital assistant (PDA), a satellite radio, a globalpositioning system, a multimedia device, a video device, a digital audioplayer (e.g., MP3 player), a camera, a game console, a tablet, a smartdevice, a wearable device, a vehicle, an electric meter, a gas pump, atoaster, or any other similar functioning device. Some of the UEs 104may be referred to as IoT devices (e.g., parking meter, gas pump,toaster, vehicles, etc.). The UE 104 may also be referred to as astation, a mobile station, a subscriber station, a mobile unit, asubscriber unit, a wireless unit, a remote unit, a mobile device, awireless device, a wireless communications device, a remote device, amobile subscriber station, an access terminal, a mobile terminal, awireless terminal, a remote terminal, a handset, a user agent, a mobileclient, a client, or some other suitable terminology.

FIG. 2 is a block diagram of a base station 210 in communication with aUE 250 in an access network. In the DL, IP packets from the core network160 may be provided to a controller/processor 275. Thecontroller/processor 275 implements layer 3 and layer 2 functionality.Layer 3 includes a radio resource control (RRC) layer, and layer 2includes a packet data convergence protocol (PDCP) layer, a radio linkcontrol (RLC) layer, and a medium access control (MAC) layer. Thecontroller/processor 275 provides RRC layer functionality associatedwith broadcasting of system information (e.g., MIB, SIBs), RRCconnection control (e.g., RRC connection paging, RRC connectionestablishment, RRC connection modification, and RRC connection release),inter radio access technology (RAT) mobility, and measurementconfiguration for UE measurement reporting; PDCP layer functionalityassociated with header compression/decompression, security (ciphering,deciphering, integrity protection, integrity verification), and handoversupport functions; RLC layer functionality associated with the transferof upper layer packet data units (PDUs), error correction through ARQ,concatenation, segmentation, and reassembly of RLC service data units(SDUs), re-segmentation of RLC data PDUs, and reordering of RLC dataPDUs; and MAC layer functionality associated with mapping betweenlogical channels and transport channels, multiplexing of MAC SDUs ontotransport blocks (TBs), demultiplexing of MAC SDUs from TBs, schedulinginformation reporting, error correction through HARQ, priority handling,and logical channel prioritization.

The transmit (TX) processor 216 and the receive (RX) processor 270implement layer 1 functionality associated with various signalprocessing functions. Layer 1, which includes a physical (PHY) layer,may include error detection on the transport channels, forward errorcorrection (FEC) coding/decoding of the transport channels,interleaving, rate matching, mapping onto physical channels,modulation/demodulation of physical channels, and MIMO antennaprocessing. The TX processor 216 handles mapping to signalconstellations based on various modulation schemes (e.g., binaryphase-shift keying (BPSK), quadrature phase-shift keying (QPSK),M-phase-shift keying (M-PSK), M-quadrature amplitude modulation(M-QAM)). The coded and modulated symbols may then be split intoparallel streams. Each stream may then be mapped to an OFDM subcarrier,multiplexed with a reference signal (e.g., pilot) in the time and/orfrequency domain, and then combined together using an Inverse FastFourier Transform (IFFT) to produce a physical channel carrying a timedomain OFDM symbol stream. The OFDM stream is spatially precoded toproduce multiple spatial streams. Channel estimates from a channelestimator 274 may be used to determine the coding and modulation scheme,as well as for spatial processing. The channel estimate may be derivedfrom a reference signal and/or channel condition feedback transmitted bythe UE 250. Each spatial stream may then be provided to a differentantenna 220 via a separate transmitter 218TX. Each transmitter 218TX maymodulate an RF carrier with a respective spatial stream fortransmission.

At the UE 250, each receiver 254RX receives a signal through itsrespective antenna 252. Each receiver 254RX recovers informationmodulated onto an RF carrier and provides the information to the receive(RX) processor 256. The TX processor 268 and the RX processor 256implement layer 1 functionality associated with various signalprocessing functions. The RX processor 256 may perform spatialprocessing on the information to recover any spatial streams destinedfor the UE 250. If multiple spatial streams are destined for the UE 250,they may be combined by the RX processor 256 into a single OFDM symbolstream. The RX processor 256 then converts the OFDM symbol stream fromthe time-domain to the frequency domain using a Fast Fourier Transform(FFT). The frequency domain signal comprises a separate OFDM symbolstream for each subcarrier of the OFDM signal. The symbols on eachsubcarrier, and the reference signal, are recovered and demodulated bydetermining the most likely signal constellation points transmitted bythe base station 210. These soft decisions may be based on channelestimates computed by the channel estimator 258. The soft decisions arethen decoded and deinterleaved to recover the data and control signalsthat were originally transmitted by the base station 210 on the physicalchannel. The data and control signals are then provided to thecontroller/processor 259, which implements layer 3 and layer 2functionality.

The controller/processor 259 can be associated with a memory 260 thatstores program codes and data. The memory 260 may be referred to as acomputer-readable medium. In the UL, the controller/processor 259provides demultiplexing between transport and logical channels, packetreassembly, deciphering, header decompression, and control signalprocessing to recover IP packets from the core network 160. Thecontroller/processor 259 is also responsible for error detection usingan ACK and/or NACK protocol to support HARQ operations.

Similar to the functionality described in connection with the DLtransmission by the base station 210, the controller/processor 259provides RRC layer functionality associated with system information(e.g., MIB, SIBs) acquisition, RRC connections, and measurementreporting; PDCP layer functionality associated with headercompression/decompression, and security (ciphering, deciphering,integrity protection, integrity verification); RLC layer functionalityassociated with the transfer of upper layer PDUs, error correctionthrough ARQ, concatenation, segmentation, and reassembly of RLC SDUs,re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; andMAC layer functionality associated with mapping between logical channelsand transport channels, multiplexing of MAC SDUs onto TBs,demultiplexing of MAC SDUs from TBs, scheduling information reporting,error correction through HARQ, priority handling, and logical channelprioritization.

Channel estimates derived by a channel estimator 258 from a referencesignal or feedback transmitted by the base station 210 may be used bythe TX processor 268 to select the appropriate coding and modulationschemes, and to facilitate spatial processing. The spatial streamsgenerated by the TX processor 268 may be provided to different antenna252 via separate transmitters 254TX. Each transmitter 254TX may modulatean RF carrier with a respective spatial stream for transmission. The ULtransmission is processed at the base station 210 in a manner similar tothat described in connection with the receiver function at the UE 250.Each receiver 218RX receives a signal through its respective antenna220. Each receiver 218RX recovers information modulated onto an RFcarrier and provides the information to a RX processor 270.

The controller/processor 275 can be associated with a memory 276 thatstores program codes and data. The memory 276 may be referred to as acomputer-readable medium. In the UL, the controller/processor 275provides demultiplexing between transport and logical channels, packetreassembly, deciphering, header decompression, control signal processingto recover IP packets from the UE 250. IP packets from thecontroller/processor 275 may be provided to the core network 160. Thecontroller/processor 275 is also responsible for error detection usingan ACK and/or NACK protocol to support HARQ operations.

New radio (NR) may refer to radios configured to operate according to anew air interface (e.g., other than Orthogonal Frequency DivisionalMultiple Access (OFDMA)-based air interfaces) or fixed transport layer(e.g., other than Internet Protocol (IP)). NR may utilize OFDM with acyclic prefix (CP) on the uplink and downlink and may include supportfor half-duplex operation using time division duplexing (TDD). NR mayinclude Enhanced Mobile Broadband (eMBB) service targeting widebandwidth (e.g. 80 MHz beyond), millimeter wave (mmW) targeting highcarrier frequency (e.g. 60 GHz), massive MTC (mMTC) targetingnon-backward compatible MTC techniques, and/or mission criticaltargeting ultra-reliable low latency communications (URLLC) service.

A single component carrier bandwidth of 100 MHZ may be supported. In oneexample, NR resource blocks (RBs) may span 12 sub-carriers with asub-carrier bandwidth of 60 kHz over a 0.125 ms duration or a bandwidthof 15 kHz over a 0.5 ms duration. Each radio frame may consist of 20 or80 subframes (or NR slots) with a length of 10 ms. Each subframe mayindicate a link direction (i.e., DL or UL) for data transmission and thelink direction for each subframe may be dynamically switched. Eachsubframe may include DL/UL data as well as DL/UL control data. UL and DLsubframes for NR may be as described in more detail below with respectto FIGS. 5 and 6 .

The NR RAN may include a central unit (CU) and distributed units (DUs).A NR BS (e.g., gNB, 5G Node B, Node B, transmission reception point(TRP), access point (AP)) may correspond to one or multiple BSs. NRcells can be configured as access cells (ACells) or data only cells(DCells). For example, the RAN (e.g., a central unit or distributedunit) can configure the cells. DCells may be cells used for carrieraggregation or dual connectivity and may not be used for initial access,cell selection/reselection, or handover. In some cases DCells may nottransmit synchronization signals (SS) in some cases DCells may transmitSS. NR BSs may transmit downlink signals to UEs indicating the celltype. Based on the cell type indication, the UE may communicate with theNR BS. For example, the UE may determine NR BSs to consider for cellselection, access, handover, and/or measurement based on the indicatedcell type.

FIG. 3 illustrates an example logical architecture 300 of a distributedRAN, according to aspects of the present disclosure. A 5G access node306 may include an access node controller (ANC) 302. The ANC may be acentral unit (CU) of the distributed RAN 300. The backhaul interface tothe next generation core network (NG-CN) 304 may terminate at the ANC.The backhaul interface to neighboring next generation access nodes(NG-ANs) 310 may terminate at the ANC. The ANC may include one or moreTRPs 308 (which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs,APs, or some other term). As described above, a TRP may be usedinterchangeably with “cell.”

The TRPs 308 may be a distributed unit (DU). The TRPs may be connectedto one ANC (ANC 302) or more than one ANC (not illustrated). Forexample, for RAN sharing, radio as a service (RaaS), and servicespecific ANC deployments, the TRP may be connected to more than one ANC.A TRP may include one or more antenna ports. The TRPs may be configuredto individually (e.g., dynamic selection) or jointly (e.g., jointtransmission) serve traffic to a UE.

The local architecture of the distributed RAN 300 may be used toillustrate fronthaul definition. The architecture may be defined thatsupport fronthauling solutions across different deployment types. Forexample, the architecture may be based on transmit network capabilities(e.g., bandwidth, latency, and/or jitter). The architecture may sharefeatures and/or components with LTE. According to aspects, the nextgeneration AN (NG-AN) 310 may support dual connectivity with NR. TheNG-AN may share a common fronthaul for LTE and NR.

The architecture may enable cooperation between and among TRPs 308. Forexample, cooperation may be preset within a TRP and/or across TRPs viathe ANC 302. According to aspects, no inter-TRP interface may beneeded/present.

According to aspects, a dynamic configuration of split logical functionsmay be present within the architecture of the distributed RAN 300. ThePDCP, RLC, MAC protocol may be adaptably placed at the ANC or TRP.

FIG. 4 illustrates an example physical architecture of a distributed RAN400, according to aspects of the present disclosure. A centralized corenetwork unit (C-CU) 402 may host core network functions. The C-CU may becentrally deployed. C-CU functionality may be offloaded (e.g., toadvanced wireless services (AWS)), in an effort to handle peak capacity.A centralized RAN unit (C-RU) 404 may host one or more ANC functions.Optionally, the C-RU may host core network functions locally. The C-RUmay have distributed deployment. The C-RU may be closer to the networkedge. A distributed unit (DU) 406 may host one or more TRPs. The DU maybe located at edges of the network with radio frequency (RF)functionality.

FIG. 5 is a diagram 500 showing an example of a DL-centric subframe. TheDL-centric subframe may include a control portion 502. The controlportion 502 may exist in the initial or beginning portion of theDL-centric subframe. The control portion 502 may include variousscheduling information and/or control information corresponding tovarious portions of the DL-centric subframe. In some configurations, thecontrol portion 502 may be a physical DL control channel (PDCCH), asindicated in FIG. 5 . The DL-centric subframe may also include a DL dataportion 504. The DL data portion 504 may sometimes be referred to as thepayload of the DL-centric subframe. The DL data portion 504 may includethe communication resources utilized to communicate DL data from thescheduling entity (e.g., UE or BS) to the subordinate entity (e.g., UE).In some configurations, the DL data portion 504 may be a physical DLshared channel (PDSCH).

The DL-centric subframe may also include a common UL portion 506. Thecommon UL portion 506 may sometimes be referred to as an UL burst, acommon UL burst, and/or various other suitable terms. The common ULportion 506 may include feedback information corresponding to variousother portions of the DL-centric subframe. For example, the common ULportion 506 may include feedback information corresponding to thecontrol portion 502. Non-limiting examples of feedback information mayinclude an ACK signal, a NACK signal, a HARQ indicator, and/or variousother suitable types of information. The common UL portion 506 mayinclude additional or alternative information, such as informationpertaining to random access channel (RACH) procedures, schedulingrequests (SRs), and various other suitable types of information.

As illustrated in FIG. 5 , the end of the DL data portion 504 may beseparated in time from the beginning of the common UL portion 506. Thistime separation may sometimes be referred to as a gap, a guard period, aguard interval, and/or various other suitable terms. This separationprovides time for the switch-over from DL communication (e.g., receptionoperation by the subordinate entity (e.g., UE)) to UL communication(e.g., transmission by the subordinate entity (e.g., UE)). One ofordinary skill in the art will understand that the foregoing is merelyone example of a DL-centric subframe and alternative structures havingsimilar features may exist without necessarily deviating from theaspects described herein.

FIG. 6 is a diagram 600 showing an example of an UL-centric subframe.The UL-centric subframe may include a control portion 602. The controlportion 602 may exist in the initial or beginning portion of theUL-centric subframe. The control portion 602 in FIG. 6 may be similar tothe control portion 502 described above with reference to FIG. 5 . TheUL-centric subframe may also include an UL data portion 604. The UL dataportion 604 may sometimes be referred to as the pay load of theUL-centric subframe. The UL portion may refer to the communicationresources utilized to communicate UL data from the subordinate entity(e.g., UE) to the scheduling entity (e.g., UE or BS). In someconfigurations, the control portion 602 may be a physical DL controlchannel (PDCCH).

As illustrated in FIG. 6 , the end of the control portion 602 may beseparated in time from the beginning of the UL data portion 604. Thistime separation may sometimes be referred to as a gap, guard period,guard interval, and/or various other suitable terms. This separationprovides time for the switch-over from DL communication (e.g., receptionoperation by the scheduling entity) to UL communication (e.g.,transmission by the scheduling entity). The UL-centric subframe may alsoinclude a common UL portion 606. The common UL portion 606 in FIG. 6 maybe similar to the common UL portion 506 described above with referenceto FIG. 5 . The common UL portion 606 may additionally or alternativelyinclude information pertaining to channel quality indicator (CQI),sounding reference signals (SRSs), and various other suitable types ofinformation. One of ordinary skill in the art will understand that theforegoing is merely one example of an UL-centric subframe andalternative structures having similar features may exist withoutnecessarily deviating from the aspects described herein.

In some circumstances, two or more subordinate entities (e.g., UEs) maycommunicate with each other using sidelink signals. Real-worldapplications of such sidelink communications may include public safety,proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V)communications, Internet of Everything (IoE) communications, IoTcommunications, mission-critical mesh, and/or various other suitableapplications. Generally, a sidelink signal may refer to a signalcommunicated from one subordinate entity (e.g., UE1) to anothersubordinate entity (e.g., UE2) without relaying that communicationthrough the scheduling entity (e.g., UE or BS), even though thescheduling entity may be utilized for scheduling and/or controlpurposes. In some examples, the sidelink signals may be communicatedusing a licensed spectrum (unlike wireless local area networks, whichtypically use an unlicensed spectrum).

To support multiple downlink control information (M-DCI) based multipletransmission and reception point (TRP) (M-TRP) transmission, a UE mayneed to duplicate several feature/components to support decoding ofmultiple PDCCH/PDSCH within a time slot. In certain circumstances, it isnot necessary to enable the almost doubled computation effort or memorycost. In certain configurations, for PDCCH monitoring/decoding, the UE704 may be assigned with CORESETs corresponding to each TRP. The numberof configured CORESET at a UE may be increased (e.g., to 5 from 3). Thenumber of blind detection/decoding (BD) or Control Channel Element (CCE)monitoring occasions may be also increased to support M-DCI based M-TRPoperation.

As described supra, it is not necessary to let a UE always operate insuch an M-DCI based mode, because not all scenarios are suitable forM-TRP operation. For example, the two serving links between a UE and twoTRPs should be with similar channel strength. Otherwise, dynamic pointselection with data coming from only one TRP is may be a better choiceto avoid inter-TRP interference. Network side can acquire informationfor the channel strength via channel state information (CSI) feedback,which may include L1-RSRP reports or CQI reports. For example, if thesecond CQI for link between the UE and TRP #2 is much lower than the CQIassociated with the strongest TRP (TRP #1), this UE is not suitable formulti-DCI. Thus, multi-DCI may not need to be enabled at the UE.

FIG. 7 is a diagram 700 illustrating communications between a UE 704 anda TRP 702 and a TRP 703. The TRP 702 and the TRP 703 may be coordinatedTRPs. The UE 704 supports multiple-PDCCH based multiple-TRP/paneltransmission. In this example, the TRP 702 may transmit downlink controlinformation 722 (e.g., in a PDCCH) and data 724 (e.g., in a PDSCH), andthe TRP 703 may transmit downlink control information 732 (e.g., in aPDCCH) and data 734 (e.g., in a PDSCH), simultaneously to the UE 704.The TRP 702 and the TRP 703 may transmit control and data signals on thesame resource grid. The TRP 702 and the TRP 703 each may be located at adifferent base station.

Further, as described infra, the UE 704 can be configured to enable anddisable multiple-TRP data reception functionalities. The UE 704 may senda reception capability indication 752 to the TRP 702/TRP 703. Thereception capability indication 752 indicates capabilities of the UE 704for receiving data from multiple TRPs concurrently. The TRP 702 and/orthe TRP 703 may send an M-DCI configuration 712 to the UE 704, based onwhich the UE 704 can determine whether to enable or disable a mechanismfor concurrent multi-TRP reception. Accordingly, the UE 704 can enableor disable the multiple-TRP data reception functionalities.

FIG. 8 illustrates a resource grid 802 of a carrier 810 in a slot 800,in which the UE 704 may communicate with the TRP 702 and the TRP 703simultaneously. In this example, the resource grid 802 includes 14symbol periods (OFDM symbols), namely, symbol period 0 to symbol period13. Further, the resource grid 802 includes multiple subcarriers.

In certain circumstances, the UE 704 may be configured to communicatewith the TRP 702 and the TRP 703 in the slot 800 concurrently. In oneexample, the UE 704 may receive from the TRP 702 a configurationspecifying that a CORSET 822 and some other CORESETs in a first pool maybe used to carry a PDCCH transmitted from the TRP 702 to the UE 704; theUE 704 may receive from the TRP 702 a configuration specifying that aCORSET 824 and some other CORESETs in a second pool may be used to carrya PDCCH transmitted from the TRP 703 to the UE 704. In certainconfigurations, the CORESETs used to carry the PDCCH from the TRP 702 donot overlap with the CORESETs used to carry the PDCCH from the TRP 703.

In another example, the UE 704 may receive from the TRP 702 aconfiguration specifying that certain candidates of the CORSET 822 orthe CORSET 824 may be used to carry the PDCCH transmitted from the TRP702; the UE 704 may receive from the TRP 703 a configuration specifyingthat certain other candidates of the CORSET 822 or the CORSET 824 may beused to carry the PDCCH transmitted from the TRP 703. In certainconfigurations, in the same CORESET, the candidates used to carry thePDCCH transmitted from the TRP 702 do not overlap with the candidatesused to carry the PDCCH transmitted from the TRP 703. It is achievableif the two TRPs are connected with an ideal backhaul.

In one technique, the TRP 702 and/or the TRP 703 can send an M-DCIconfiguration 712 to the UE 704. Upon receiving the M-DCI configuration712, the UE 704 can determine, based on the M-DCI configuration 712,whether to enable or disable the mechanism of the UE 704 for receivingcontrol and/or data transmission from multiple TRPs concurrently. Incertain configurations, the M-DCI configuration 712 can be carried in anRRC message. In certain configurations, the M-DCI configuration 712 canbe sent to the UE 704 semi-statically through MAC CE or through the DCI722 and/or the DCI 732.

Further, in certain configurations, the M-DCI configuration 712transmitted from the TRP 702/TRP 703 may explicitly indicate to the UE704 that the mechanism for concurrent reception from the TRP 702 and theTRP 703 should be enabled (as the TRP 702 and the TRP 703 may transmitDCI concurrently to the UE 704) or disabled. A field of the M-DCIconfiguration 712 may use a particular value (e.g., “1”) to indicateenablement and another particular value (e.g., “0”) to indicatedisablement.

In certain configurations, the M-DCI configuration 712 transmitted fromthe TRP 702/TRP 703 may implicitly indicate to the UE 704 that themechanism for concurrent DCI reception from the TRP 702 and the TRP 703should be enabled or disabled. In particular, a value of a field of theM-DCI configuration 712 that is used to specify another feature can beused by the UE 704 to determine enablement or disablement ofmultiple-TRP reception. For example, the UE 704 can make such adetermination based on number of CORESET pools specified by the M-DCIconfiguration 712.

Furthermore, the UE 704 may send a reception capability indication 752to the TRP 702 and/or the TRP 703. The reception capability indication752 indicates a capacity of the UE 704 for receiving multiple down linkcontrol channels concurrently. In particular, the reception capabilityindication 752 may indicate whether the UE supports features ofreceiving multiple down link control channels concurrently. Thereception capability indication 752 may also indicate a maximum totalnumber of CORESETs allowed in a particular slot such that the UE 704 canperform blind decoding on those CORESETs. The reception capabilityindication 752 may also indicate a maximum total number of blinddecoding that the UE is allowed to perform to obtain PDCCHs carried in aslot. The reception capability indication 752 may also indicate amaximum number of blind decoding operations that the UE is allowed toperform in order to obtain a down link control channel from oneparticular TRP. The reception capability indication 752 may alsoindicate a maximum number of CORESETs, CCEs, or aggregation level thatare allowed to be assigned to one particular TRP.

In this example, the TRP 702 and/or the TRP 703 send an M-DCIconfiguration 712 to the UE 704 through an RRC message. The M-DCIconfiguration 712 may have a parameter that indicates two pools ofCORESETs are allocated in the slot 800. A first pool of CORESETs may beused to carry PDCCHs transmitted from the TRP 702. A second pool ofCORESETs may be used to carry PDCCHs transmitted from the TRP 703. Forexample, the first pool may include the CORSET 822; the second pool mayinclude the CORSET 824. Accordingly, the UE 704 may monitor the CORSET822 and perform blind decoding on the CORSET 822 to obtain a PDCCH 832transmitted from the TRP 702. Concurrently, the UE 704 may monitor theCORSET 824 and perform blind decoding on the CORSET 824 to obtain aPDCCH 834 transmitted from the TRP 703.

Subsequently, upon detecting the PDCCH 832 from the TRP 702 and thePDCCH 834 from the TRP 703, the UE 704 can determine resource elementsin the slot 800 used to carry a PDSCH 842 from the TRP 702 and resourceelements in the slot 800 used to carry a PDSCH 844 from the TRP 703. Assuch, the UE 704 can demodulate and decode modulation symbols carried onthe PDSCH 842 and the PDSCH 844 in order to obtain data transmitted fromthe TRP 702 and the TRP 703 to the UE 704, respectively.

FIG. 9 is a flow chart 900 of a method (process) for receiving datatransmitted from multiple TRPs. The method may be performed by a firstUE (e.g., the UE 704, the apparatus 1002, and the apparatus 1002′).

At operation 902, the UE sends an indication to at least one of a firstTRP and a second TRP. The indication indicates a capacity of the UE forreceiving multiple down link control channels concurrently. In certainconfigurations, the indication indicates at least one of: (a) whetherthe UE supports receiving multiple down link control channelsconcurrently, (b) a maximum total number of control resource sets(CORESETs) in the particular slot, (c) a maximum total number of blinddecoding that the UE is allowed to perform, and (d) a maximum number ofblind decoding that the UE is allowed to perform to obtain one of thefirst down link control channel and the second down link controlchannel.

At operation 904, the UE receives a first trigger. At operation 906, theUE determines, based on the first trigger, whether it is possible thatthe first TRP and the second TRP are to transmit a first down linkcontrol channel and a second down link control channel to the UEconcurrently in a particular slot on a carrier.

When it is not possible that the first TRP and the second TRP are totransmit a first down link control channel and a second down linkcontrol channel to the UE concurrently in the particular slot on acarrier, at operation 908, the UE monitors one of the first down linkcontrol channel and the second down link control channel in theparticular slot.

When it is possible that the first TRP and the second TRP are totransmit a first down link control channel and a second down linkcontrol channel to the UE concurrently in the particular slot on acarrier, at operation 910, the UE operates to monitor one of the firstdown link control channel and the second down link control channel inthe particular slot.

In particular, to monitor the first down link control channel and thesecond down link control channel in the particular slot, at operation912 the UE determines a first set of candidates in the particular slotallowed to carry the first down link control channel and a second set ofcandidates in the particular slot allowed to carry the second down linkcontrol channel. At operation 914, the UE performs blind decoding of onthe first set of candidates to obtain the first down link controlchannel. At operation 916, the UE performs blind decoding of on thesecond set of candidates to obtain the second down link control channel.

In certain configurations, the first set of candidates and the secondset of candidates are in respective different control resource sets(CORESETs) in the particular slot. In certain configurations, the firstset of candidates and the second set of candidates are in a same controlresource set (CORESET) in the particular slot.

In certain configurations, the first trigger is a higher layerconfiguration. In certain configurations, the higher layer configurationis a configuration carried in a Radio Resource Control (RRC) message. Incertain configurations, the first trigger is a configuration carried ina media access control (MAC) control element (CE) or in a downlinkcontrol information (DCI) message.

FIG. 10 is a conceptual data flow diagram 1000 illustrating the dataflow between different components/means in an exemplary apparatus 1002.The apparatus 1002 may be a UE. The apparatus 1002 includes a receptioncomponent 1004, a M-TRP configuration component 1006, a monitoringcomponent 1008 and a transmission component 1010.

The M-TRP configuration component 1006 sends an indication to at leastone of a first TRP and a second TRP. The indication indicates a capacityof the UE for receiving multiple down link control channelsconcurrently. In certain configurations, the indication indicates atleast one of: (a) whether the UE supports receiving multiple down linkcontrol channels concurrently, (b) a maximum total number of controlresource sets (CORESETs) in the particular slot, (c) a maximum totalnumber of blind decoding that the UE is allowed to perform, and (d) amaximum number of blind decoding that the UE is allowed to perform toobtain one of the first down link control channel and the second downlink control channel.

The M-TRP configuration component 1006 receives a first trigger. TheM-TRP configuration component 1006 determines, based on the firsttrigger, whether it is possible that the first TRP and the second TRPare to transmit a first down link control channel and a second down linkcontrol channel to the UE concurrently in a particular slot on acarrier.

When it is not possible that the first TRP and the second TRP are totransmit a first down link control channel and a second down linkcontrol channel to the UE concurrently in the particular slot on acarrier, the monitoring component 1008 monitors one of the first downlink control channel and the second down link control channel in theparticular slot.

When it is possible that the first TRP and the second TRP are totransmit a first down link control channel and a second down linkcontrol channel to the UE concurrently in the particular slot on acarrier, the monitoring component 1008 operates to monitor the firstdown link control channel and the second down link control channel inthe particular slot.

In particular, to monitor the first down link control channel and thesecond down link control channel in the particular slot, the M-TRPconfiguration component 1006 determines a first set of candidates in theparticular slot allowed to carry the first down link control channel anda second set of candidates in the particular slot allowed to carry thesecond down link control channel. The monitoring component 1008 performsblind decoding of on the first set of candidates to obtain the firstdown link control channel. The monitoring component 1008 performs blinddecoding of on the second set of candidates to obtain the second downlink control channel.

In certain configurations, the first set of candidates and the secondset of candidates are in respective different CORESETs in the particularslot. In certain configurations, the first set of candidates and thesecond set of candidates are in a same CORESET in the particular slot.

In certain configurations, the first trigger is a higher layerconfiguration. In certain configurations, the higher layer configurationis a configuration carried in an RRC message. In certain configurations,the first trigger is a configuration carried in a MAC CE or in a DCImessage.

FIG. 11 is a diagram 1100 illustrating an example of a hardwareimplementation for an apparatus 1002′ employing a processing system1114. The apparatus 1002′ may be a UE. The processing system 1114 may beimplemented with a bus architecture, represented generally by a bus1124. The bus 1124 may include any number of interconnecting buses andbridges depending on the specific application of the processing system1114 and the overall design constraints. The bus 1124 links togethervarious circuits including one or more processors and/or hardwarecomponents, represented by one or more processors 1104, the receptioncomponent 1004, the M-TRP configuration component 1006, the monitoringcomponent 1008, the transmission component 1010, and a computer-readablemedium/memory 1106. The bus 1124 may also link various other circuitssuch as timing sources, peripherals, voltage regulators, and powermanagement circuits, etc.

The processing system 1114 may be coupled to a transceiver 1110, whichmay be one or more of the transceivers 254. The transceiver 1110 iscoupled to one or more antennas 1120, which may be the communicationantennas 252.

The transceiver 1110 provides a means for communicating with variousother apparatus over a transmission medium. The transceiver 1110receives a signal from the one or more antennas 1120, extractsinformation from the received signal, and provides the extractedinformation to the processing system 1114, specifically the receptioncomponent 1004. In addition, the transceiver 1110 receives informationfrom the processing system 1114, specifically the transmission component1010, and based on the received information, generates a signal to beapplied to the one or more antennas 1120.

The processing system 1114 includes one or more processors 1104 coupledto a computer-readable medium/memory 1106. The one or more processors1104 are responsible for general processing, including the execution ofsoftware stored on the computer-readable medium/memory 1106. Thesoftware, when executed by the one or more processors 1104, causes theprocessing system 1114 to perform the various functions described suprafor any particular apparatus. The computer-readable medium/memory 1106may also be used for storing data that is manipulated by the one or moreprocessors 1104 when executing software. The processing system 1114further includes at least one of the reception component 1004, the M-TRPconfiguration component 1006, the monitoring component 1008, and thetransmission component 1010. The components may be software componentsrunning in the one or more processors 1104, resident/stored in thecomputer readable medium/memory 1106, one or more hardware componentscoupled to the one or more processors 1104, or some combination thereof.The processing system 1114 may be a component of the UE 250 and mayinclude the memory 260 and/or at least one of the TX processor 268, theRX processor 256, and the communication processor 259.

In one configuration, the apparatus 1002/apparatus 1002′ for wirelesscommunication includes means for performing each of the operations ofFIG. 9 . The aforementioned means may be one or more of theaforementioned components of the apparatus 1002 and/or the processingsystem 1114 of the apparatus 1002′ configured to perform the functionsrecited by the aforementioned means.

As described supra, the processing system 1114 may include the TXProcessor 268, the RX Processor 256, and the communication processor259. As such, in one configuration, the aforementioned means may be theTX Processor 268, the RX Processor 256, and the communication processor259 configured to perform the functions recited by the aforementionedmeans.

It is understood that the specific order or hierarchy of blocks in theprocesses/flowcharts disclosed is an illustration of exemplaryapproaches. Based upon design preferences, it is understood that thespecific order or hierarchy of blocks in the processes/flowcharts may berearranged. Further, some blocks may be combined or omitted. Theaccompanying method claims present elements of the various blocks in asample order, and are not meant to be limited to the specific order orhierarchy presented.

The previous description is provided to enable any person skilled in theart to practice the various aspects described herein. Variousmodifications to these aspects will be readily apparent to those skilledin the art, and the generic principles defined herein may be applied toother aspects. Thus, the claims are not intended to be limited to theaspects shown herein, but is to be accorded the full scope consistentwith the language claims, wherein reference to an element in thesingular is not intended to mean “one and only one” unless specificallyso stated, but rather “one or more.” The word “exemplary” is used hereinto mean “serving as an example, instance, or illustration.” Any aspectdescribed herein as “exemplary” is not necessarily to be construed aspreferred or advantageous over other aspects. Unless specifically statedotherwise, the term “some” refers to one or more. Combinations such as“at least one of A, B, or C,” “one or more of A, B, or C,” “at least oneof A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or anycombination thereof” include any combination of A, B, and/or C, and mayinclude multiples of A, multiples of B, or multiples of C. Specifically,combinations such as “at least one of A, B, or C,” “one or more of A, B,or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and“A, B, C, or any combination thereof” may be A only, B only, C only, Aand B, A and C, B and C, or A and B and C, where any such combinationsmay contain one or more member or members of A, B, or C. All structuraland functional equivalents to the elements of the various aspectsdescribed throughout this disclosure that are known or later come to beknown to those of ordinary skill in the art are expressly incorporatedherein by reference and are intended to be encompassed by the claims.Moreover, nothing disclosed herein is intended to be dedicated to thepublic regardless of whether such disclosure is explicitly recited inthe claims. The words “module,” “mechanism,” “element,” “device,” andthe like may not be a substitute for the word “means.” As such, no claimelement is to be construed as a means plus function unless the elementis expressly recited using the phrase “means for.”

What is claimed is:
 1. A method of wireless communication of a userequipment (UE), comprising: sending an indication to at least one of afirst transmission and reception point (TRP) and a second TRP, theindication indicating a maximum total number of blind detections formonitoring multiple physical downlink control channels (PDCCHs) frommultiple TRPs and a maximum total number of control resource sets(CORESETs) in which the multiple PDCCHs from the multiple TRPs aremonitored by the UE; receiving, at the UE, a first trigger that enablesthe UE to perform multiple PDCCH based concurrent multiple-TRP receptionwith the first TRP and the second TRP; receiving parameters according towhich the UE perform multiple-PDCCH reception with the first TRP and thesecond TRP not exceeding a capability of the UE indicated by theindication; and performing the multiple-PDCCH reception according to theparameters in response to receiving the first trigger.
 2. The method ofclaim 1, the method further comprising: determining, based on the firsttrigger, whether it is possible that the first TRP and the second TRPare to transmit a first down link control channel and a second down linkcontrol channel to the UE concurrently on a carrier; and monitoring thefirst down link control channel and the second down link control channelin a particular slot when it is possible that the first TRP and thesecond TRP are to transmit the first down link control channel and thesecond down link control channel to the UE concurrently on the carrier,wherein the first trigger is a higher layer configuration.
 3. The methodof claim 2, wherein the higher layer configuration is a configurationcarried in a Radio Resource Control (RRC) message.
 4. The method ofclaim 2, wherein the first trigger is a configuration carried in a mediaaccess control (MAC) control element (CE) or in a downlink controlinformation (DCI) message.
 5. The method of claim 2, wherein themonitoring the first down link control channel and the second down linkcontrol channel further comprises: determining a first set of candidatesin the particular slot allowed to carry the first down link controlchannel and a second set of candidates in the particular slot allowed tocarry the second down link control channel; performing blind decoding ofon the first set of candidates to obtain the first down link controlchannel; and performing blind decoding of on the second set ofcandidates to obtain the second down link control channel.
 6. The methodof claim 5, wherein the first set of candidates and the second set ofcandidates are in respective different control resource sets (CORESETs)in the particular slot.
 7. The method of claim 5, wherein the first setof candidates and the second set of candidates are in a same controlresource set (CORESET) in the particular slot.
 8. An apparatus forwireless communication, the apparatus being a user equipment (UE),comprising: a memory; and at least one processor coupled to the memoryand configured to: send an indication to at least one of a firsttransmission and reception point (TRP) and a second TRP, the indicationindicating a maximum total number of blind detections for monitoringmultiple physical downlink control channels (PDCCHs) from multiple TRPsand a maximum total number of control resource sets (CORESETs) in whichthe multiple PDCCHs from the multiple TRPs are monitored by the UE;receive, at the UE, a first trigger that enables the UE to performmultiple PDCCH based concurrent multiple-TRP reception with the firstTRP and the second TRP; receive parameters according to which the UEperform multiple-PDCCH reception with the first TRP and the second TRPnot exceeding a capability of the UE indicated by the indication; andperform the multiple-PDCCH reception according to the parameters inresponse to receiving the first trigger.
 9. The apparatus of claim 8,wherein the at least one processor is further configured to: determine,based on the first trigger, whether it is possible that the first TRPand the second TRP are to transmit a first down link control channel anda second down link control channel to the UE concurrently on a carrier;and monitor the first down link control channel and the second down linkcontrol channel in a particular slot when it is possible that the firstTRP and the second TRP are to transmit the first down link controlchannel and the second down link control channel to the UE concurrentlyon the carrier, wherein the first trigger is a higher layerconfiguration.
 10. The apparatus of claim 9, wherein the higher layerconfiguration is a configuration carried in a Radio Resource Control(RRC) message.
 11. The apparatus of claim 9, wherein the first triggeris a configuration carried in a media access control (MAC) controlelement (CE) or in a downlink control information (DCI) message.
 12. Theapparatus of claim 9, wherein to monitor the first down link controlchannel and the second down link control channel further comprises, theat least one processor is further configured to: determine a first setof candidates in the particular slot allowed to carry the first downlink control channel and a second set of candidates in the particularslot allowed to carry the second down link control channel; performblind decoding of on the first set of candidates to obtain the firstdown link control channel; and perform blind decoding of on the secondset of candidates to obtain the second down link control channel. 13.The apparatus of claim 12, wherein the first set of candidates and thesecond set of candidates are in respective different control resourcesets (CORESETs) in the particular slot.
 14. The apparatus of claim 12,wherein the first set of candidates and the second set of candidates arein a same control resource set (CORESET) in the particular slot.
 15. Anon-transitory computer-readable medium storing computer executable codefor wireless communication of a user equipment (UE), comprising code to:send an indication to at least one of a first transmission and receptionpoint (TRP) and a second TRP, the indication indicating a maximum totalnumber of blind detections for monitoring multiple physical downlinkcontrol channels (PDCCHs) from multiple TRPs and a maximum total numberof control resource sets (CORESETs) in which the multiple PDCCHs fromthe multiple TRPs are monitored by the UE; receive, at the UE, a firsttrigger that enables the UE to perform multiple PDCCH based concurrentmultiple-TRP reception with the first TRP and the second TRP; receiveparameters according to which the UE perform multiple-PDCCH receptionwith the first TRP and the second TRP not exceeding a capability of theUE indicated by the indication; and perform the multiple-PDCCH receptionaccording to the parameters in response to receiving the first trigger.16. The non-transitory computer-readable medium of claim 15, wherein thecode is further configured to: determine, based on the first trigger,whether it is possible that the first TRP and the second TRP are totransmit a first down link control channel and a second down linkcontrol channel to the UE concurrently on a carrier; and monitor thefirst down link control channel and the second down link control channelin a particular slot when it is possible that the first TRP and thesecond TRP are to transmit the first down link control channel and thesecond down link control channel to the UE concurrently on the carrier,wherein the first trigger is a higher layer configuration.